Sites like iLovePDF or Smallpdf handle basic merging and splitting for free.
: Adobe shut down the activation servers for Acrobat 7 in 2012. This means original serial numbers often fail to verify because they cannot reach the server. adobe acrobat 7.0 professional free activation code
Legally, no. While Adobe previously provided a special "non-activating" version of the software with a universal serial number for existing owners who could no longer activate their original copies, those links and serial numbers have largely been retired or removed from official support pages. Sites like iLovePDF or Smallpdf handle basic merging